Re: [RFC v2] net/core: add optional threading for rps backlog processing

[Felix Fietkau]

On 17.02.23 13:23, Eric Dumazet wrote:
> On Fri, Feb 17, 2023 at 11:06 AM Felix Fietkau <nbd@xxxxxxxx> wrote:
> > When dealing with few flows or an imbalance on CPU utilization, static RPS
> > CPU assignment can be too inflexible. Add support for enabling threaded NAPI
> > for RPS backlog processing in order to allow the scheduler to better balance
> > processing. This helps better spread the load across idle CPUs.
> >
> > Signed-off-by: Felix Fietkau <nbd@xxxxxxxx>
> > ---
> >
> > RFC v2:
> >  - fix rebase error in rps locking
>
> Why only deal with RPS ?
>
> It seems you propose the sofnet_data backlog be processed by a thread,
> instead than from softirq ?
Right. I originally wanted to mainly improve RPS, but my patch does 
cover backlog in general. I will update the description in the next 
version. Does the approach in general make sense to you?

Thanks,

- Felix